What's wrong with the computer motherboard?

The computer motherboard has broken down cause analysis:

(1) The jumper is plugged in incorrectly. Of the 5 jumpers to be plugged in, there are 2 (hard drive lights, reset lights) that have polarity, if this is reversed, will burn the motherboard or hardware.

(2) If not careful, when installed, some metal did not notice good, hanging on the motherboard, when the machine lit. The motherboard will be burnt out. Or the machine is running. Accidentally, put the water in (of course this is very unlikely).

(3) The filter capacitor is burnt out. Although only a capacitor, but the capacitor in the motherboard is mainly used to ensure the voltage and current stability (filter action). Let us not overlook it. Because we know what it does, it's conceivable that the capacitance affects the motherboard (voltage and current effects on the motherboard).

(4) In the previous PS, if you do not shut down the case, directly unplug the mouse or keyboard, the same will burn the motherboard. But now the new motherboard supports hot plug, so that's fine.

(5) The quality of the power supply must also be considered, if the voltage and current instability, the motherboard will be greatly affected. Directly causing the burn of the circuit.

(6) Too much dust or a short circuit caused by wet, causing the circuit, the motherboard may burn out. (Own things, to be more regular cleaning Oh!)

(7) Overclocking, if overclocking will also make the motherboard load increase, if, more than the limit, it will burn. But now the hardware development is quite fast, overclocking has become the past.

(8) There is a problem with the quality of the motherboard itself. that is powerless.

Additional computer motherboard is broken and the solution:

The computer motherboard structure is more complex, the fault rate is high, the fault distribution is also more dispersed. According to the source of the fault, the motherboard fault can be divided into power failure, bus failure, component failure and so on. The main causes of the motherboard failure include the following.

Components reason: The motherboard on the chip and other components of poor quality, resulting in the motherboard aging damage, resulting in the motherboard failure.

Artificial reason: In the use of computers, random hot plug hardware or random metal to touch a variety of connectors to cause the motherboard failure.

Dust, electrostatic reasons: due to dust or static caused the motherboard contact bad, short-circuit or burned the motherboard on the chip, which led to the motherboard failure.

Contact bad reason: due to rust, oxidation, elasticity weakened, pin off welding, broken and other causes of the board of various chips, sockets, interface poor contact, and lead to motherboard failure.

For the motherboard features and fault reasons, when the motherboard fails, the motherboard troubleshooting methods are as follows.

The 1th step: first carefully look at the motherboard of each slot, fan, Chip and so there are no signs of damage: There is no burning on the motherboard, burning, foaming, plate cut off, the mouth rust, capacitor burst slurry place: Whether the BIOS battery has electricity. If there are obvious damage to the area to be targeted maintenance.

2nd Step: If there is no obvious damage on the motherboard traces, and then clean the board with a soft brush dust, after cleaning check the motherboard is normal. If normal, it is the dust caused by the fault.

3rd Step: If the dust after cleaning, or not normal, and then use a multimeter to measure the motherboard of the various power supply voltage is normal (+5v, +12v, +3.3v, etc.). If there is an abnormal voltage, check the power supply and its motherboard electrical circuit is faulty.

4th step: If the motherboard voltage is normal, and then to the motherboard power check, see the motherboard has no fever chip. If there is a heating chip, first check the heat of the chip input, output end whether there is a signal (see waveform). If there is an input signal, no output signal, and then check whether the heating chip has a clock signal. If there is, then this chip damage, replacement can be, if no clock signal, follow the chip connected to the circuit to check the chip before the first level, until the failure to find the components.

5th step: Find the fault components, not from the motherboard to take off, you can choose the same type of chip connected to it, and then the boot to observe whether normal. If the motherboard fails to disappear, the chip is damaged and the chip is replaced.

6th step: If the motherboard is still faulty, then use the tangent, borrow line method to find a short route. If the discovery of some signal lines and ground or +5v voltage line and other short-circuit, you can cut off the line and then measure to determine whether the chip problem or motherboard circuit board line problem.

7th step: If the above method does not work, use the control method to find a similar type of motherboard to measure the corresponding chip pin waveform and its parameters to confirm the chip is damaged.